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| SPS injector complex | |
|---|---|
| Name | SPS injector complex |
| Location | CERN, Meyrin, Switzerland |
| Coordinates | 46.233, 6.055 |
| Established | 1976 (SPS commissioning) |
| Operator | CERN |
| Primary beam | Protons, Ions |
| Purpose | Injection for Super Proton Synchrotron, fixed-target physics, LHC injector chain |
SPS injector complex
The SPS injector complex is the ensemble of accelerator facilities, transfer lines, and technical systems that supply particle beams to the Super Proton Synchrotron and downstream experiments. It integrates multiple accelerator machines, cryogenic and radiofrequency installations, and control infrastructure to deliver high-intensity proton and ion beams for experiments at CERN and for injection into the Large Hadron Collider and fixed-target programs. The complex interacts closely with international collaborations, national laboratories, and industrial partners including Fermi National Accelerator Laboratory, DESY, and KEK.
The SPS injector complex spans multiple accelerator stages and transfer lines that prepare beam parameters required by the Super Proton Synchrotron and the Large Hadron Collider. It connects upstream sources such as the LINAC family and synchrotrons including Proton Synchrotron and ISOLDE-related facilities, coordinating with institutions such as European Organization for Nuclear Research stakeholders and partner labs like Institut Laue–Langevin. The complex supports experiments at sites such as NA61/SHINE, COMPASS, and fixed-target programs at CERN North Area. Its operation involves collaboration with accelerator physics groups influenced by work at Stanford Linear Accelerator Center and Brookhaven National Laboratory.
Development of the injector complex followed milestones set by the commissioning of the Super Proton Synchrotron in the 1970s and the evolution of CERN's injector chain. Early upgrades reflected technologies from the Proton Synchrotron Booster and lessons from projects such as the Intersecting Storage Rings and CERN Neutrinos to Gran Sasso. Major modernization phases paralleled events including the construction of the Large Hadron Collider and the LHC Injector Upgrade initiatives, with collaborations involving the European Committee for Future Accelerators and funding discussions in the context of Framework Programme cycles. Technical advancements were informed by accelerator science achievements at CERN Accelerator School courses and conferences like International Particle Accelerator Conference.
Key components include the ion and proton sources, radiofrequency acceleration systems, beam transfer lines, magnet power supplies, vacuum systems, cryogenics, and diagnostics. The injector complex houses systems influenced by development at Institut National de Physique Nucléaire et de Physique des Particules groups and vendor partnerships with companies akin to those working on ITER components. Infrastructure elements draw on engineering practices used in projects like Large Electron–Positron Collider and the Compact Linear Collider. Operational buildings sit near administrative and technical centers such as Meyrin and interact with control rooms modeled after installations at Diamond Light Source and SOLEIL.
Beam production begins at source stations providing H- or ionized species, followed by linear acceleration in machines comparable to LINAC4 and then injection into circular stages like the Proton Synchrotron Booster and the Proton Synchrotron. Transfer lines route beams via magnet arrays and septa toward the Super Proton Synchrotron and onward to the Large Hadron Collider injection regions. Beam commissioning procedures leverage techniques developed at TRIUMF, Paul Scherrer Institute, and GSI Helmholtz Centre for Heavy Ion Research. Timing and synchronization depend on clocking systems influenced by standards from European Organization for Nuclear Research timing groups and metrology practices from National Physical Laboratory.
Operational control uses a supervisory control and data acquisition framework integrated with accelerator control software inspired by EPICS and the JCOP framework. Machine protection and interlock systems interface with experiment scheduling groups such as those for CERN Fixed-Target campaigns and LHC filling procedures coordinated with ATLAS, CMS, LHCb, and ALICE operations. Beam tuning and optics corrections employ diagnostics techniques validated in studies at CERN Accelerator and Beam Physics divisions and follow protocols from international bodies like International Atomic Energy Agency when relevant. Staff training draws on curricula from institutions including École Polytechnique and Technical University of Munich.
Performance metrics include intensity, emittance, repetition rate, and availability, benchmarked against targets set during SPS upgrade projects and LHC luminosity goals. Upgrades have covered enhancements to RF systems, magnet power converters, and injection hardware, influenced by programs such as the High-Luminosity Large Hadron Collider project and collaborations with CERN Future Circular Collider studies. Future plans consider integration of novel accelerator concepts from research at Max Planck Institute for Physics, adoption of superconducting RF developments voiced at European Particle Physics Strategy meetings, and potential synergies with proposals from NuPECC and national funding agencies.
Radiation protection protocols comply with regulatory guidance from organizations such as the International Commission on Radiological Protection, national authorities in Switzerland, and CERN’s internal safety rules developed in consultation with World Health Organization advisors when appropriate. Environmental monitoring addresses activation of materials, groundwater protection, and waste management following practices used in projects like ITER and research reactors overseen by European Radiation Protection Authorities. Emergency response and occupational safety training incorporate standards from International Labour Organization and coordinate with local emergency services in Geneva and cantonal authorities.